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Method for deeply extracting calcium sulfate from phosphorus ore acid hydrolysis liquid

A technology of deep extraction and acid hydrolysis, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of difficult recovery of phosphogypsum, high requirements for raw materials, long process flow, etc., and achieve moderate particle size and shortened The production process and the effect of a wide range of applications

Pending Publication Date: 2021-04-09
KINGENTA ECOLOGICAL ENG GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problems existing in the prior art, such as long process flow, high requirements for raw materials, and difficult recovery of phosphogypsum, the present invention provides a method for deep extraction of calcium sulfate from phosphate rock acid hydrolysis solution to solve the above technical problems

Method used

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  • Method for deeply extracting calcium sulfate from phosphorus ore acid hydrolysis liquid
  • Method for deeply extracting calcium sulfate from phosphorus ore acid hydrolysis liquid
  • Method for deeply extracting calcium sulfate from phosphorus ore acid hydrolysis liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Investigate the effect of humic acid on the purification of acid hydrolysis solution

[0030] Take phosphate rock from Lufa Phosphate Mine in Guizhou, crush it to a particle size of figure 1 and figure 2 .

[0031] Further investigation on the addition of humic acid found that when the addition of humic acid was less than 5%, the flocculation time increased with the decrease of the addition; when the addition was ≥5%, the flocculation time did not change much. Therefore, the added amount of humic acid is selected to be 5-10% based on the weight of the added phosphate rock.

Embodiment 2

[0033] Investigate the influence of each parameter in the two crystallizations

[0034] Take the purified acid solution after humic acid flocculation in Example 1 as the test raw material for follow-up research. First, carry out component content analysis on the purified acid solution, the results are as follows in Table 1:

[0035] Table 1 - content test results

[0036] project P 2 o 5

[0037] (1) Influence of the two crystallization temperatures on the size of the product

[0038] The present invention investigates the effect of the temperature of the two crystallization processes on the particle size of the prepared product. Add sulfuric acid or sulfate to the purified acid solution for one-time crystallization, control the reaction temperature (HH) at 30-70°C for 2 hours, and crystallize to obtain a calcium sulfate hemihydrate mixed solution; then control the temperature of the calcium sulfate hemihydrate mixed solution (DH) When the temperature is 30-...

Embodiment 3

[0066] Investigate the applicability of phosphate rock from different sources to this process

[0067] In order to avoid the defects of the freezing method widely used in foreign countries - the disadvantage of high requirements on raw materials, this method specially takes phosphate rocks from different sources of phosphate rocks to test the applicability range of raw materials for this process, and the content of iron, magnesium and aluminum is from high to low. wait. The content of each component in the selected phosphate rock is shown in the following table 8:

[0068] Table 8-Component content (%) in different phosphate rocks

[0069] source P 2 o 5

MgO al 2 o 3

K 2 o

Na 2 o

SO 4 2-

CaO Fe 2 o 3

SiO 2

F -

Linyi Sanqi 30.07 0.51 3.51 0.30 0.13 0 43.17 1.93 15.28 2.00 Guizhou Lufa 32.92 1.94 1.16 0.84 0.71 2.36 48.57 1.15 7.18 2.46 Jinan Railway 28.72 2.40 2.06 0.29 ...

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Abstract

The invention relates to a method for deeply extracting calcium sulfate from phosphorus ore acid hydrolysis liquid, and belongs to the technical field of chemical production. The method comprises the following steps: (1) acid hydrolysis; (2) acid hydrolysis liquid purification; and (3) calcium removal and crystal transformation. The calcium removal purification comprises two crystallization processes, calcium sulfate hemi-hydrate is generated by primary crystallization, and secondary crystallization is to add a seed crystal into a primary crystallization reaction solution to prepare calcium sulfate dihydrate. According to the method, the optimal conditions in each process are controlled by adopting a mode of flocculating and then crystallizing twice, so that the production process is effectively shortened, the requirement on the content of the used raw material (phosphorus ores) is relatively low, the application range is wide, and the method is not limited by the quality of the phosphorus ores. The produced calcium sulfate dihydrate product is moderate in crystal form particle size, the phosphorus content can be as low as 0.2%, and further utilization of phosphogypsum is better facilitated.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a method for deep extraction of calcium sulfate from phosphate rock acid hydrolysis solution. Background technique [0002] Phosphate rock is an important strategic resource of the country. Phosphate rock is the main raw material for the production of phosphate fertilizers and phosphorus chemical products, and is irreplaceable. People in the industry call phosphate rock the "mother of phosphate fertilizers", which is related to world food security and the development of the phosphate industry. my country is rich in phosphate rock resources, but they are non-renewable. Due to continuous mining, the overall quantity is constantly decreasing. The Ministry of Land and Resources has already listed phosphate rock as one of the 20 minerals that cannot meet the needs of national economic development after 2010. At present, in the field of phosphate rock development, there a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46
CPCC01F11/46C01P2006/80C01P2004/03C01P2004/61C01P2004/60
Inventor 邹朋张强郑磊刘文龙付强强沈彦辉齐英杰宋国发于南树孟鑫
Owner KINGENTA ECOLOGICAL ENG GRP
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